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Dr. Chittaranjan Verma delivered this lecture for Digital Image Processing course at B R Ambedkar National Institute of Technology. It includes: Announcement, Color, Space, Models, System, Facilitate, Specification, Corresponds
Typology: Slides
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Color models (Color space orcolor system) ^ To facilitate the specification of colors, a color modelis used to specify a 3D coordinate system for colorrepresentation^ ^ Hardware-oriented color models: RGB model for colormonitors and color video cameras,^ ^ CMY model for color printers^ ^ YIQ model for color TV broadcast^ ^ HSI model decouples the color and the gray scaleinformation and closely corresponds to the human eyeinterpretation of colors
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RGB color model^8
(^3) (2 )^ 16, 777, 216 colors
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RGB color model: Safe colors
RGB Safe Color Cube
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CMY and CMYK color model ^ Assume all color values are normalized to [0,1] ^ The^
CMY^ color
model
is^ used
in^ connection
with
generating hardcopy output CMY color model: CMYK:^
K^ is^ the
fourth^
color,^ black;
because
equal
amount of CMY produces a muddy-looking black, sinceblack is the predominant color in printing, we need toproduce true, pure black
1 1 1 C^
R M^
G Y^
B ^ ^
^
^ ^
^
^ ^
^ ^ ^
^
^ ^
^
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HSI color model ^ RGB and CMY are not well suited for describingcolors for human interpretation ^ Hue (H), Saturation (S), and Intensity (I)^ ^ Hue: color attribute that describes a pure color (e.g., pureyellow or red)^ ^ Saturation: a measurement of the degree to which a purecolor is diluted by white light^ ^ Intensity can be decoupled from the color information (Hand S) ^ HSI is ideal for processing color image based on thecolor sensing properties of the human visual system
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HSI color model ^ Intensity (I)The line joining vertex (0,0,0): black and vertex(1,1,1): white. All points along this axis are gray.
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HSI color model: Visualization
The Hue component describesthe color itself in the form of anangle between [0,360] degrees. 0degree mean red, 120 meansgreen, 240 means blue. 60degrees is yellow, 300 degrees is
magenta.
^ Circular color plane perpendicular to the vertical intensity axisThe Saturation component signalshow much the color is polluted withwhite color. The range of the Scomponent is [0,1].
The Intensity range is between[0,1] and 0 means black, 1means white.
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HSI color model: Visualization^ ^ Triangular color plane perpendicular to the vertical intensityaxis
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Conversion between RGB andHSI models ^ HSI^
^ RGB:
Given values of HSI in the range [0,1]
Fo r 240^360 (1^ ) cos^1 cos(^
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